64634688 has 42 divisors (see below), whose sum is σ = 185265314. Its totient is φ = 21544704.

The previous prime is 64634683. The next prime is 64634723. The reversal of 64634688 is 88643646.

64634688 is a `hidden beast` number, since 6 + 4 + 634 + 6 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51151104 + 13483584 = 7152^2 + 3672^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64634681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55531 + ... + 56682.

Almost surely, 2^64634688 is an apocalyptic number.

It is an amenable number.

64634688 is an abundant number, since it is smaller than the sum of its proper divisors (120630626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64634688 is a wasteful number, since it uses less digits than its factorization.

64634688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112231 (or 112218 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 64634688 is about 8039.5701377623. The cubic root of 64634688 is about 401.3179196174.

The spelling of 64634688 in words is "sixty-four million, six hundred thirty-four thousand, six hundred eighty-eight".